Research The Effect Of The Particle Size Of Rutile Of E5003 Coat Electrodes Performance

With the rapid development of nano-technology and nano-materials, scholars began to explore the field of nano-materials in welding research and applications. So far a variety of nano-materials and nano-technology have been exploited into the field of welding. Nano- technology and materials have been extensively studied in welding materials, welding structures, welding technology, welding protection etc. But nowdays nano-welding materials are still stayed in the special welding materials, at the same time, the research tendency of welding materials have also made certain impact in the development of general welding materials. The ultra-fine powder or nano-materials in welding of the performance of ordinary coat electrodes little research is currently no systematic theory. Based on this, this paper use Wuhan TEMO welding material Co.,LTD's mature E5003 coat electrodes-based formula, and change the particle size of rutile,to research how the rutile particle size and nano-TiO2 will affect the variation of the coat electrodes performance and the problems. We also study how the scale of such material will effect the coat electrodes performance, so as to enrich the theory of welding material and the development way.In the research trials, we use planetary ball milling to process different particle size of rutile powder and which is superfine powder. TiO2 is obtained by purchase. In the Experimental design, we use the rutile we made by different milling time to totally replace the original recipe,and then suppress new qualified coat electrodes to experiment and test their performance. At the same time,we add different proportions of TiO2 to replace rutile, and also suppress new qualified coat electrodes to experiment and test their performance. Scanning electron microscopy is used to calculate the average powder particle size with differet milling time, XRD diffraction analysis is used to calculate the average size of nano- TiO2. we use GX-temperature properties to measure the melting point of coated electrodes and study their melting characteristics of such electrodes coating. We use Hannover arc-quality analyzer to research the arc welding characteristics. According to national standard and self-assessment test platform, including the arc of the electrode, breaking arc length, slag rate, forming quality, spatter, the electrode melting coefficient of determination and deposition efficiency. And then glycerol to determine the diffusible hydrogen content of deposited metal. Optical microscopy and scanning electron microscope to observe the weld specimen fracture surface.These microscope analysis results are used to analysis the essence problems that why mechanical properties change. Deposited metal impact test, tensile test, deposited metal chemical composition analysis are used to comprehensively study the variation of coat electrodes performance.The studies show that when adding superfine powder of rutile, the coat electrodes quality appears better, coating structure becomes more dense, the coat maybe broken when drying, the appearance color is close to the milling retile, there are significant changes in mechanical properties. Adding nano-TiO2, with the increase of nano-TiO2 percentage, suppressing coat electrodes wil be change from easy to hard, with the percentage of nano-TiO2 changes, it will be white and the structures turn to be denser, the surface of coating may appear wrinkled, there are significant changes in the in mechanical properties of coat electrodes.The results show that when fine powder of rutile was added to the coat electrodes,it can improve the mechanical properties, improve the impact toughness of deposited metal, and then with the rutile particle size decreases, the increasing trend tend to be more obvious, when the size reaches a certain range, the decrease of particle size of rutile will decrease the mechanical performance. Such coat electrodes process performance will also appear regular variation.The study also showed that the rutile in the coat that milled 24h will acquire a best performance. Nano-TiO2 in new coated electrodes can improve the impact toughness of deposited metal, process performance, it also can improve the the mechanical properties. The research shows that adding 50% Nano-TiO2 in electrode coating is the best performance. It is worth noting that the tensile test show that the strength of deposited metal electrode decreased slightly, but all little more than the national standards.